我不断收到此错误 Objects are not valid as a React child {} 如果您要呈现子集合，请改用数组

Question

This is currently how my code looks

import React from 'react';
import './App.css';

class App extends React.Component {
 
  state = {
  apiData: []
  }
 
  render() {   
    
  console.log('api data is')
    return (
      <div>
        <center>
        <h1 id="title">hello something</h1></center>
        <h1 id="date">{this.state.apiData.title}</h1>
      </div>
    )
  }
 
  componentDidMount() {
    fetch('http://www.mocky.io/v2/5dece3d333000052002b9037')
      .then(response => response.json())
      .then(data => {
        this.setState({
          apiData: data
        })
      })        
      console.log("component fetched data")
  }
}
 
export default App

I get this error when I try access something that has a value but when I do this

     <h1 id="date">{this.state.apiData.date}</h1>

It works

not too sure how to fix as everything I have seen thus far is for data they have created through a const or let as opposed to fetching data from an API

Answer 1

apiData.title is of type Object , not an Array of JSX children or strings.

You need to use apiData.title.rendered , as shown in this snippet of response data from the API:

  "title": {
    "rendered": "Whatsapp and Facebook Messenger: how group chat is changing the dynamic of our friendships"
  },

Answer 2

Try with a null check {this.state.apiData.title?.rendered}

Update: Try to open the link you're fetching the data from and follow the paths inside, for hero_image you need {this.state.apiData.acf?.hero_image.url}

Answer 3

As render fire before state set so you need to check before state update and use condition or && on "this.state.apiData.title" like this

 class App extends React.Component { state = { apiData: [] } render() { console.log('api data is') return ( <div> <center> <h1 id="title">hello something</h1></center> <h1 id="date">{this.state.apiData.title && this.state.apiData.title.rendered}</h1> </div> ) } componentDidMount() { fetch('http://www.mocky.io/v2/5dece3d333000052002b9037').then(response => response.json()).then(data => { this.setState({ apiData: data }) }) console.log("component fetched data") } } ReactDOM.render( <App />, document.getElementById('root'));

 <div id="root" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>